ABB MD21 - Terminal Block X3 Residual Current Input; Residual Current Transformer Terminals; 10 RCT Circuit Wirng

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MOTOR CONTROL AND PROTECTION UNIT M10X USER GUIDE
Terminal no. Name Description
X3:6 Ioa Residual current transformer input A
X3:7 Iob Residual current transformer input B
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
Terminal block X3 Residual current input
M10x supports earth fault protection by
wiring external residual current trans-
former(RCT) to X3 :6 & 7. M10x dedicated
RCT type is ABB LNG CT. (Fig 10)
08 M10x-M X3 Modbus Dual ports wiring
09 M10x-P X3 Profibus wiring
Wiring Tip:
Standard twisted pair cable should be
used to wire RCT inputs. When earth fault
protection function is not required, X3: 6
&7 should be shorted.
10 RCT circuit wirng